What Plans Are Needed for a Residential Title 24 Report?
Proposed floor plans, elevations and a window schedule, plus whatever is known about the existing construction. On an existing house the as-built condition matters as much as the new work.
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The part that is specific to existing houses
On new construction the drawings describe everything. On a house, half the building already exists and often was never documented. The report still has to account for it, because an addition connects to existing walls and an altered system sits in an existing duct run.
So alongside the proposed drawings, what helps most is anything that establishes the existing condition: the year built, whether the walls have been insulated since, whether the windows are original single glazing or have been replaced, what the current heating and cooling equipment is, and where the ducts run.
When nobody knows
That is normal and it does not stop a report. Where the existing construction cannot be established, the code allows default assumptions based on the vintage of the house. Those defaults are deliberately conservative, which means a design assessed on them has to work slightly harder than one assessed on verified conditions.
That trade is worth knowing about. If a wall is going to be opened up anyway, confirming what is inside it can be cheaper than designing around a pessimistic default.
The drawings themselves
A dimensioned floor plan showing existing and proposed, elevations, and a window and door schedule with sizes and orientation. A site plan with a north arrow settles orientation, which drives how glazing is assessed. If the mechanical scope is known — the replacement equipment, whether ducts are being touched, roughly how much duct is being replaced — send it, because that determines whether field verification comes into play.
PDFs are what we work from. A finished permit set is not needed; design stage is better, because the results can still change the design.